Maintenance Chart - DeWalt DW650LAG Instruction Manual

High altitude performance can be improved by specific modifica-
tions to the carburetor. If you always operate your engine at altitudes
above 1,524 meters (5,000 feet), have your authorized service cen-
ter perform a carburetor modification.
Even with a carburetor modification, engine horsepower will decrease
about 3.5% for each 300 meter (1,000 feet) increase in altitude. The
effect of altitude on horsepower will be greater than this if no car-
buretor modification is made. A decrease in engine horsepower will
decrease the power output of the engine.
NOTE: When the carburetor has been modified for high altitude
operation, the air-fuel mixture will be too lean for low altitude use. If
the engine is used at low altitudes after a carburetor modification, the
carburetor may cause the engine to overheat and result in serious
engine damage. For use at low altitudes, have your authorized ser-
vice center return the carburetor to original factory specifications.
MAINTENANCE
WARNING: When cleaning, use only mild soap and a damp cloth
on plastic parts. Many household cleaners contain chemicals which
could seriously damage plastic. Also, do not use gasoline, turpen-
tine, lacquer or paint thinner, dry cleaning fluids or similar products
which may seriously damage plastic parts. Never let any liquid get
inside the engine; never immerse engine into a liquid.
The following procedures must be followed when maintenance or
service is performed on the engine.
Any service operations not included in this section should be performed
by a D WALT factory service center or a D
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center.
This engine is only for use in D WALT approved applications. If used
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in unapproved applications, D WALT is not responsible for repairs or
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damage and the warranty if void.

Maintenance Chart

PROCEDURE
Clean air filter (3)
Check oil level
Change oil (1,2,3)
Clean spark plug
Clean engine's exterior
Check and adjust valve clearance
(.15 mm intake, .2 mm exhaust) (2)
Clean spark
arrester (if equipped)
Clean debris screen (if equipped)
1. The engine oil must be changed after the first 20 hours of
2. See D
3. Perform more frequently in dusty or humid conditions
Cleaning Air Filter Element (Fig. 1)
WALT authorized service
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WARNING: Hot surfaces. Risk of burn. Engine and surrounding
parts are very hot, do not touch (see the Hot Surfaces identified in
Figure 1). Allow engine to cool prior to servicing.
A dirty air cleaner will restrict airflow to the carburetor. To prevent
carburetor mal func tion, service the air filter regularly. Service more
frequently when operating the engine in extremely dusty areas.
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operation. Thereafter change oil every 150 hours of operation
or monthly, whichever comes first.
WALT shop manual for detail instructions.
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